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Engineering · Electrical Engineering
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Electric motors mechanical rotational speed and torque depends on the voltage of their electrical input and the frequency of the electrical input Both of these coming out of the mains are fixed. This means that most induction motors run at a single rated speed only. For applications that require speed control (such as pumps and fans, where the mechanical torque needed varies as the square of speed), we use a variable speed drive. This lets us have control of both the voltage and speed, by using some fancy electronics that are beyond the scope of this course. These fancy electronics let us have any input voltage pattern we want, but the voltage gets only three possible values:+170V, -170V, and 0 V. For this problem, a medium sized (5ish horse) electric motor in a variable speed drive can be considered as just a big inductor with an inductance of about 3 millihenries. This will smooth out a jagged voltage curve into a piecewise linear current This is because of the relatonship for inductors TASK: DESIGN two sets of voltage pulses a) The irst set of pulses should integrate into an approxima tely sinusoidal current with a frequency 60Hz and an amplitude of 30 Amps. b) The second set of pulses should integrate into an approximately sinusoidal current with a frequency of 30Hz and an amplitude of about 15 Amps. The voltages may only have value+170V,-170V, or OV,(that is, piecewise constant). The width and spacing pattern of pulses can be whatever you want.
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